Have a ROPIEEE with display running in my music room. Noticed several times that after some days w/o restarting it, the watch display freezes. Restarted it.
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I have had that happen a few times over the years… in my cases, the problem ended up being the SD card (not the Pi or RoPieee), as re-flashes to the same card didn’t change the results. Your problem may be different.